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(function( jQuery ) {
var // Static reference to slice
sliceDeferred = [].slice;
jQuery.extend({
Deferred: function( func ) {
var doneList = jQuery.Callbacks( "once memory" ),
failList = jQuery.Callbacks( "once memory" ),
progressList = jQuery.Callbacks( "memory" ),
state = "pending",
lists = {
resolve: doneList,
reject: failList,
notify: progressList
},
promise = {
done: doneList.add,
fail: failList.add,
progress: progressList.add,
state: function() {
return state;
},
// Deprecated
isResolved: doneList.fired,
isRejected: failList.fired,
always: function() {
deferred.done.apply( deferred, arguments ).fail.apply( deferred, arguments );
return this;
},
then: function( fnDone, fnFail, fnProgress ) {
return jQuery.Deferred(function( newDefer ) {
jQuery.each( {
done: [ fnDone, "resolve" ],
fail: [ fnFail, "reject" ],
progress: [ fnProgress, "notify" ]
}, function( handler, data ) {
var fn = data[ 0 ],
action = data[ 1 ],
returned;
if ( jQuery.isFunction( fn ) ) {
deferred[ handler ](function() {
returned = fn.apply( this, arguments );
if ( returned && jQuery.isFunction( returned.promise ) ) {
returned.promise().done( newDefer.resolve ).fail( newDefer.reject ).progress( newDefer.notify );
} else {
newDefer[ action + "With" ]( this === deferred ? newDefer : this, [ returned ] );
}
});
} else {
deferred[ handler ]( newDefer[ action ] );
}
});
}).promise();
},
// Get a promise for this deferred
// If obj is provided, the promise aspect is added to the object
promise: function( obj ) {
if ( obj == null ) {
obj = promise;
} else {
for ( var key in promise ) {
obj[ key ] = promise[ key ];
}
}
return obj;
}
},
deferred,
key;
// Keep pipe for back-compat
promise.pipe = promise.then;
// Construct deferred
deferred = promise.promise({});
for ( key in lists ) {
deferred[ key ] = lists[ key ].fire;
deferred[ key + "With" ] = lists[ key ].fireWith;
}
// Handle state
deferred.done( function() {
state = "resolved";
}, failList.disable, progressList.lock ).fail( function() {
state = "rejected";
}, doneList.disable, progressList.lock );
// Call given func if any
if ( func ) {
func.call( deferred, deferred );
}
// All done!
return deferred;
},
// Deferred helper
when: function( firstParam ) {
var args = sliceDeferred.call( arguments ),
i = 0,
length = args.length,
pValues = new Array( length ),
count = length,
pCount = length,
deferred = length <= 1 && firstParam && jQuery.isFunction( firstParam.promise ) ?
firstParam :
jQuery.Deferred(),
promise = deferred.promise();
function resolveFunc( i ) {
return function( value ) {
args[ i ] = arguments.length > 1 ? sliceDeferred.call( arguments ) : value;
if ( !( --count ) ) {
deferred.resolveWith( deferred, args );
}
};
}
function progressFunc( i ) {
return function( value ) {
pValues[ i ] = arguments.length > 1 ? sliceDeferred.call( arguments ) : value;
deferred.notifyWith( promise, pValues );
};
}
if ( length > 1 ) {
for ( ; i < length; i++ ) {
if ( args[ i ] && args[ i ].promise && jQuery.isFunction( args[ i ].promise ) ) {
args[ i ].promise().done( resolveFunc(i) ).fail( deferred.reject ).progress( progressFunc(i) );
} else {
--count;
}
}
if ( !count ) {
deferred.resolveWith( deferred, args );
}
} else if ( deferred !== firstParam ) {
deferred.resolveWith( deferred, length ? [ firstParam ] : [] );
}
return promise;
}
});
})( jQuery );
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